| FEF | forced expiratory flow |
|---|---|
| FEF50 | forced expiratory flow at 50% of forced vital capacity |
| FEF50/FIF50 | ratio of expiratory flow to inspiratory flow at 50% of forced vital capacity |
| FEFV | forced expiratory flow volume |
| FES | family environment scale; fat embolism syndrome; flame emission spectroscopy; forced expiratory spir... |